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An explanation is proposed for the recent observation that in ultrathin Sn films there is apparently a universal normal-state sheet resistance above which superconductivity cannot be established. It is demonstrated that when the sheet resistance is larger than the quantum of resistance, RQ=h4e², the order parameter suffers phase slips due to quantum tunneling driving the film normal at low temperature. This value of the resistance agrees quantitatively with experiment.
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Matthew P. A. Fisher (1986) studied this question.
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